[3] He returned for the start of 2004, finishing 3rd in the championship despite not being at full fitness early in the season (a further crash caused a broken collarbone).

[1] In the first race, he collided with Noriyuki Haga while battling for the lead on the final lap.

[1][7] Also in 2007, Kagayama teamed up with Kousuke Akiyoshi to win the prestigious Suzuka 8 Hours endurance race for Suzuki.

Again he had an injury-hit season, and was easily the lowest-placed of the three works Suzuki riders in the standings.

In 2010 Kagayama returned to the British Superbike Championship riding for the Worx Suzuki team.